get a temp gun, and wrap aluminim foil around the head, ideal 3 tanks threw it keeping the temp no less than 200f. lean the boutem end a hafe turn and the top a quater turn, then with the foil still on easily drive it around agin keep the temps above 200f, do this for 3 tanks, now your ready to lean everthing about a quater turn and start giving it busts of full throttle. the bigest thing is to keep the temps over 200f and take it easy for a little whaile.